Open .NAV file Extension

The error "There is no application set to open the document." is a common problem faced by millions of Mac users daily. This happens either because the required app to open that file does not exist or there might be some malicious apps tempering your Mac

.NA

What is .NAV file?

Navigation mesh used by games developed with the id Tech 3 game engine or a derivative of the id Tech 3 engine such as Valve's Source Engine; saves a mesh of walkable areas within a .BSP map file; allows artificial intelligence (AI) bots to know how to move around the map.
NAV files are automatically generated by the game engine when a user first plays a map with bots. The loading process may take several minutes for large maps. You can manually start the NAV generation process by typing nav_generate in the game console. You can also edit navigation meshes manually by typing nav_generate 1 in the game console while "sv_cheats" is enabled.
NAV files are similar to .AIN files, but AIN files are more commonly used for non-player characters (NPCs) instead of bots.
NOTE: Example games that use NAV files include Quake 3 (id Tech 3 engine), Counter Strike: Source (Source Engine), and Team Fortress 2 (Source Engine).